Anti-fog measures for image capture device

ABSTRACT

An image capture device includes a housing; a lens cover disposed on the housing; a lens disposed within the housing beneath the lens cover; a lens cavity defined between the lens and the lens cover; a battery cavity defined within the housing; a lens vent fluidly coupling the lens cavity and the battery cavity; a battery disposed within the battery cavity; and a desiccant patch coupled to a side of the battery. Moisture introduced into the battery cavity by the battery, the lens cavity, or the lens vent is absorbed by the desiccant patch.

CROSS REFERENCE TO RELATED APPLICATION(S)

This application claims priority to U.S. Provisional Application No.62/900,916, filed Sep. 16, 2019, the content of which is incorporated byreference herein in its entirety.

TECHNICAL FIELD

This disclosure relates to image capture devices, and more specifically,to submersible cameras with anti-fog or fogging reduction features forimproved capture clarity in a variety of operational environments.

BACKGROUND

Many physical activities, such as boating, surfing, swimming, skiing,etc. can occur in environments where moisture content or relativehumidity levels within the environment are high. Use of traditionalcameras in these environments often requires the addition of cumbersomeprotective housings to block moisture from negatively impactingsensitive camera electronics. However, these housings can be bulky andsensitive to fogging if sealing is not sufficient or if a change in theenvironment, such as a switch from a warm environment to a cold, wetenvironment occurs rapidly.

Photography during physical activity has been improved by the use ofsimple-to-operate, lightweight, compact cameras with integratedwaterproofing features such as enhanced seals that remove the need foradditional protective housings in underwater, rainy, snowy, or humidenvironments. However, some forms of moisture intrusion, such as a userloading a wet battery into a dry camera or operating a camera for a longperiod of time in a warm, humid, and/or wet environment, cannot beaddressed by enhanced sealing alone.

SUMMARY

Disclosed herein are implementations of an image capture device. Theimage capture device includes a housing; a lens cover disposed on thehousing; a lens disposed within the housing beneath the lens cover; alens cavity defined between the lens and the lens cover; a batterycavity defined within the housing; a lens vent fluidly coupling the lenscavity and the battery cavity; a battery disposed within the batterycavity; and a desiccant patch coupled to a side of the battery. Moistureintroduced into the battery cavity by the battery, the lens cavity, orthe lens vent is absorbed by the desiccant patch.

Disclosed herein are implementations of an image capture deviceincluding a housing and a battery cavity defined within the housing. Theimage capture device includes a removable door separating the batterycavity and an external environment and a lens disposed in the housingproximate to the battery cavity. The image capture device includes alens cover disposed over the lens, contacting the housing, and fluidlyseparating the lens from an external environment and includes a lenscavity defined between the lens and the lens cover. The image capturedevice includes a seal obstructing a channel that fluidly couples thelens cavity and the battery cavity and a housing vent that is fluidlycouple the battery cavity and the external environment.

Disclosed herein are implementations of an image capture deviceincluding a battery cavity and a housing surrounding the battery cavity.The image capture device includes a lens insertable into the housing ata location proximate to the battery cavity and a lens cover contactingthe housing and fluidly separating the lens from an externalenvironment. The image capture device includes a lens cavity between thelens and the lens cover and a seal obstructing a fluid path between thelens cavity and the battery cavity. The image capture device includes ahousing vent connecting the battery cavity and an external environmentsurrounding the image capture device.

BRIEF DESCRIPTION OF THE DRAWINGS

The disclosure is best understood from the following detaileddescription when read in conjunction with the accompanying drawings. Itis emphasized that, according to common practice, the various featuresof the drawings are not to-scale. On the contrary, the dimensions of thevarious features are arbitrarily expanded or reduced for clarity.

FIGS. 1A-D are isometric views of an example of an image capture device.

FIGS. 2A-B are isometric views of another example of an image capturedevice.

FIG. 2C is a cross-sectional view of the image capture device of FIGS.2A-B.

FIGS. 3A-B are block diagrams of examples of image capture systems.

FIG. 4 is an isometric view of an example of another image capturedevice.

FIG. 5 is a cross-sectional view of the image capture device of FIG. 4through section 5-5.

FIG. 6A is a top view of a desiccant patch.

FIG. 6B is a side view of the desiccant patch of FIG. 6A.

FIG. 7 is a side view of a battery including the desiccant patch ofFIGS. 6A-6B.

DETAILED DESCRIPTION

Given operation in a variety of situations that may introduce moistureto an image capture device (e.g. humid environment, loading a wetbattery, etc.) and the desire to avoid external moisture reductionsolutions (e.g., external housing with additional seals) for operationalconvenience, internal moisture reduction is an important goal for small,convenient-to-use cameras in order to avoid fogging of a lens and/orlens cover of the image capture device. One mechanism to reduce moisturein any operating environment is affixing a desiccant patch to an outersurface of a battery that is loaded into a battery cavity in the imagecapture device. The battery and desiccant patch can be positioned withina battery cavity proximate to passages fluidly coupling other portionsof the image capture device such as the lens cavity. In this way, thedesiccant patch can attract and trap any moisture introduced into theimage capture device and reduce or eliminate a potential for fogging ofthe lens cover or the lens.

FIGS. 1A-D are isometric views of an example of an image capture device100. The image capture device 100 may include a body 102 having a lens104 structured on a front surface of the body 102, various indicators onthe front of the surface of the body 102 (such as LEDs, displays, andthe like), various input mechanisms (such as buttons, switches, andtouch-screen mechanisms), and electronics (e.g., imaging electronics,power electronics, etc.) internal to the body 102 for capturing imagesvia the lens 104 and/or performing other functions. The image capturedevice 100 may be configured to capture images and video and to storecaptured images and video for subsequent display or playback.

The image capture device 100 may include various indicators, includingLED lights 106 and LCD display 108. The image capture device 100 mayalso include buttons 110 configured to allow a user of the image capturedevice 100 to interact with the image capture device 100, to turn theimage capture device 100 on, to operate latches or hinges associatedwith doors of the image capture device 100, and/or to otherwiseconfigure the operating mode of the image capture device 100. The imagecapture device 100 may also include a microphone 112 configured toreceive and record audio signals in conjunction with recording video.

The image capture device 100 may include an I/O interface 114 (e.g.,hidden as indicated using dotted lines). As best shown in FIG. 1B, theI/O interface 114 can be covered and sealed by a removable door 115 ofthe image capture device 100. The removable door 115 can be secured, forexample, using a latch mechanism 115 a (e.g., hidden as indicated usingdotted lines) that is opened by engaging the associated button 110 asshown.

The removable door 115 can also be secured to the image capture device100 using a hinge mechanism 115 b, allowing the removable door 115 topivot between an open position allowing access to the I/O interface 114and a closed position blocking access to the I/O interface 114. Theremovable door 115 can also have a removed position (not shown) wherethe entire removable door 115 is separated from the image capture device100, that is, where both the latch mechanism 115 a and the hingemechanism 115 b allow the removable door 115 to be removed from theimage capture device 100.

The image capture device 100 may also include another microphone 116integrated into the body 102 or housing. The front surface of the imagecapture device 100 may include two drainage ports as part of a drainagechannel 118. The image capture device 100 may include an interactivedisplay 120 that allows for interaction with the image capture device100 while simultaneously displaying information on a surface of theimage capture device 100. As illustrated, the image capture device 100may include the lens 104 that is configured to receive light incidentupon the lens 104 and to direct received light onto an image sensorinternal to the lens 104.

The image capture device 100 of FIGS. 1A-D includes an exterior thatencompasses and protects internal electronics. In the present example,the exterior includes six surfaces (i.e. a front face, a left face, aright face, a back face, a top face, and a bottom face) that form arectangular cuboid. Furthermore, both the front and rear surfaces of theimage capture device 100 are rectangular. In other embodiments, theexterior may have a different shape. The image capture device 100 may bemade of a rigid material such as plastic, aluminum, steel, orfiberglass. The image capture device 100 may include features other thanthose described here. For example, the image capture device 100 mayinclude additional buttons or different interface features, such asinterchangeable lenses, cold shoes and hot shoes that can add functionalfeatures to the image capture device 100, etc.

The image capture device 100 may include various types of image sensors,such as a charge-coupled device (CCD) sensors, active pixel sensors(APS), complementary metal-oxide-semiconductor (CMOS) sensors, N-typemetal-oxide-semiconductor (NMOS) sensors, and/or any other image sensoror combination of image sensors.

Although not illustrated, in various embodiments, the image capturedevice 100 may include other additional electrical components (e.g., animage processor, camera SoC (system-on-chip), etc.), which may beincluded on one or more circuit boards within the body 102 of the imagecapture device 100.

The image capture device 100 may interface with or communicate with anexternal device, such as an external user interface device, via a wiredor wireless computing communication link (e.g., the I/O interface 114).The user interface device may, for example, be the personal computingdevice 360 described below with respect to FIG. 3B. Any number ofcomputing communication links may be used. The computing communicationlink may be a direct computing communication link or an indirectcomputing communication link, such as a link including another device ora network, such as the internet, may be used.

In some implementations, the computing communication link may be a Wi-Filink, an infrared link, a Bluetooth (BT) link, a cellular link, a ZigBeelink, a near field communications (NFC) link, such as an ISO/IEC 20643protocol link, an Advanced Network Technology interoperability (ANT+)link, and/or any other wireless communications link or combination oflinks.

In some implementations, the computing communication link may be an HDMIlink, a USB link, a digital video interface link, a display portinterface link, such as a Video Electronics Standards Association (VESA)digital display interface link, an Ethernet link, a Thunderbolt link,and/or other wired computing communication link.

The image capture device 100 may transmit images, such as panoramicimages, or portions thereof, to the user interface device (not shown)via the computing communication link, and the user interface device maystore, process, display, or a combination thereof the panoramic images.

The user interface device may be a computing device, such as asmartphone, a tablet computer, a phablet, a smart watch, a portablecomputer, and/or another device or combination of devices configured toreceive user input, communicate information with the image capturedevice 100 via the computing communication link, or receive user inputand communicate information with the image capture device 100 via thecomputing communication link.

The user interface device may display, or otherwise present, content,such as images or video, acquired by the image capture device 100. Forexample, a display of the user interface device may be a viewport intothe three-dimensional space represented by the panoramic images or videocaptured or created by the image capture device 100.

The user interface device may communicate information, such as metadata,to the image capture device 100. For example, the user interface devicemay send orientation information of the user interface device withrespect to a defined coordinate system to the image capture device 100,such that the image capture device 100 may determine an orientation ofthe user interface device relative to the image capture device 100.

Based on the determined orientation, the image capture device 100 mayidentify a portion of the panoramic images or video captured by theimage capture device 100 for the image capture device 100 to send to theuser interface device for presentation as the viewport. In someimplementations, based on the determined orientation, the image capturedevice 100 may determine the location of the user interface deviceand/or the dimensions for viewing of a portion of the panoramic imagesor video.

The user interface device may implement or execute one or moreapplications to manage or control the image capture device 100. Forexample, the user interface device may include an application forcontrolling camera configuration, video acquisition, video display, orany other configurable or controllable aspect of the image capturedevice 100.

The user interface device, such as via an application, may generate andshare, such as via a cloud-based or social media service, one or moreimages, or short video clips, such as in response to user input. In someimplementations, the user interface device, such as via an application,may remotely control the image capture device 100 such as in response touser input.

The user interface device, such as via an application, may displayunprocessed or minimally processed images or video captured by the imagecapture device 100 contemporaneously with capturing the images or videoby the image capture device 100, such as for shot framing, which may bereferred to herein as a live preview, and which may be performed inresponse to user input. In some implementations, the user interfacedevice, such as via an application, may mark one or more key momentscontemporaneously with capturing the images or video by the imagecapture device 100, such as with a tag, such as in response to userinput.

The user interface device, such as via an application, may display, orotherwise present, marks or tags associated with images or video, suchas in response to user input. For example, marks may be presented in acamera roll application for location review and/or playback of videohighlights.

The user interface device, such as via an application, may wirelesslycontrol camera software, hardware, or both. For example, the userinterface device may include a web-based graphical interface accessibleby a user for selecting a live or previously recorded video stream fromthe image capture device 100 for display on the user interface device.

The user interface device may receive information indicating a usersetting, such as an image resolution setting (e.g., 3840 pixels by 2160pixels), a frame rate setting (e.g., 60 frames per second (fps)), alocation setting, and/or a context setting, which may indicate anactivity, such as mountain biking, in response to user input, and maycommunicate the settings, or related information, to the image capturedevice 100.

FIGS. 2A-B illustrate another example of an image capture device 200.The image capture device 200 includes a body 202 and two camera lenses204, 206 disposed on opposing surfaces of the body 202, for example, ina back-to-back or Janus configuration.

The image capture device may include electronics (e.g., imagingelectronics, power electronics, etc.) internal to the body 202 forcapturing images via the lenses 204, 206 and/or performing otherfunctions. The image capture device may include various indicators suchas an LED light 212 and an LCD display 214.

The image capture device 200 may include various input mechanisms suchas buttons, switches, and touchscreen mechanisms. For example, the imagecapture device 200 may include buttons 216 configured to allow a user ofthe image capture device 200 to interact with the image capture device200, to turn the image capture device 200 on, and to otherwise configurethe operating mode of the image capture device 200. In animplementation, the image capture device 200 includes a shutter buttonand a mode button. It should be appreciated, however, that, in alternateembodiments, the image capture device 200 may include additional buttonsto support and/or control additional functionality.

The image capture device 200 may also include one or more microphones218 configured to receive and record audio signals (e.g., voice or otheraudio commands) in conjunction with recording video.

The image capture device 200 may include an I/O interface 220 and aninteractive display 222 that allows for interaction with the imagecapture device 200 while simultaneously displaying information on asurface of the image capture device 200.

The image capture device 200 may be made of a rigid material such asplastic, aluminum, steel, or fiberglass. In some embodiments, the imagecapture device 200 described herein includes features other than thosedescribed. For example, instead of the I/O interface 220 and theinteractive display 222, the image capture device 200 may includeadditional interfaces or different interface features. For example, theimage capture device 200 may include additional buttons or differentinterface features, such as interchangeable lenses, cold shoes and hotshoes that can add functional features to the image capture device 200,etc.

FIG. 2C is a cross-sectional view of the image capture device 200 ofFIGS. 2A-B. The image capture device 200 is configured to capturespherical images, and accordingly, includes a first image capture device224 and a second image capture device 226. The first image capturedevice 224 defines a first field-of-view 228 as shown in FIG. 2C andincludes the lens 204 that receives and directs light onto a first imagesensor 230.

Similarly, the second image capture device 226 defines a secondfield-of-view 232 as shown in FIG. 2C and includes the lens 206 thatreceives and directs light onto a second image sensor 234. To facilitatethe capture of spherical images, the image capture devices 224, 226 (andrelated components) may be arranged in a back-to-back (Janus)configuration such that the lenses 204, 206 face in generally oppositedirections.

The fields-of-view 228, 232 of the lenses 204, 206 are shown above andbelow boundaries 236, 238, respectively. Behind the first lens 204, thefirst image sensor 230 may capture a first hyper-hemispherical imageplane from light entering the first lens 204, and behind the second lens206, the second image sensor 234 may capture a secondhyper-hemispherical image plane from light entering the second lens 206.

One or more areas, such as blind spots 240, 242 may be outside of thefields-of-view 228, 232 of the lenses 204, 206 so as to define a “deadzone.” In the dead zone, light may be obscured from the lenses 204, 206and the corresponding image sensors 230, 234, and content in the blindspots 240, 242 may be omitted from capture. In some implementations, theimage capture devices 224, 226 may be configured to minimize the blindspots 240, 242.

The fields-of-view 228, 232 may overlap. Stitch points 244, 246,proximal to the image capture device 200, at which the fields-of-view228, 232 overlap may be referred to herein as overlap points or stitchpoints. Content captured by the respective lenses 204, 206, distal tothe stitch points 244, 246, may overlap.

Images contemporaneously captured by the respective image sensors 230,234 may be combined to form a combined image. Combining the respectiveimages may include correlating the overlapping regions captured by therespective image sensors 230, 234, aligning the captured fields-of-view228, 232, and stitching the images together to form a cohesive combinedimage.

A slight change in the alignment, such as position and/or tilt, of thelenses 204, 206, the image sensors 230, 234, or both, may change therelative positions of their respective fields-of-view 228, 232 and thelocations of the stitch points 244, 246. A change in alignment mayaffect the size of the blind spots 240, 242, which may include changingthe size of the blind spots 240, 242 unequally.

Incomplete or inaccurate information indicating the alignment of theimage capture devices 224, 226, such as the locations of the stitchpoints 244, 246, may decrease the accuracy, efficiency, or both ofgenerating a combined image. In some implementations, the image capturedevice 200 may maintain information indicating the location andorientation of the lenses 204, 206 and the image sensors 230, 234 suchthat the fields-of-view 228, 232, stitch points 244, 246, or both may beaccurately determined, which may improve the accuracy, efficiency, orboth of generating a combined image.

The lenses 204, 206 may be laterally offset from each other, may beoff-center from a central axis of the image capture device 200, or maybe laterally offset and off-center from the central axis. As compared toimage capture devices with back-to-back lenses, such as lenses alignedalong the same axis, image capture devices including laterally offsetlenses may include substantially reduced thickness relative to thelengths of the lens barrels securing the lenses. For example, theoverall thickness of the image capture device 200 may be close to thelength of a single lens barrel as opposed to twice the length of asingle lens barrel as in a back-to-back configuration. Reducing thelateral distance between the lenses 204, 206 may improve the overlap inthe fields-of-view 228, 232.

Images or frames captured by the image capture devices 224, 226 may becombined, merged, or stitched together to produce a combined image, suchas a spherical or panoramic image, which may be an equirectangularplanar image. In some implementations, generating a combined image mayinclude three-dimensional, or spatiotemporal, noise reduction (3DNR). Insome implementations, pixels along the stitch boundary may be matchedaccurately to minimize boundary discontinuities.

FIGS. 3A-B are block diagrams of examples of image capture systems.

Referring first to FIG. 3A, an image capture system 300 is shown. Theimage capture system 300 includes an image capture device 310 (e.g., acamera or a drone), which may, for example, be the image capture device200 shown in FIGS. 2A-C. The image capture device 310 includes aprocessing apparatus 312 that is configured to receive a first imagefrom a first image sensor 314 and receive a second image from a secondimage sensor 316. The image capture device 310 includes a communicationsinterface 318 for transferring images to other devices. The imagecapture device 310 includes a user interface 320 to allow a user tocontrol image capture functions and/or view images. The image capturedevice 310 includes a battery 322 for powering the image capture device310. The components of the image capture device 310 may communicate witheach other via the bus 324.

The processing apparatus 312 may be configured to perform image signalprocessing (e.g., filtering, tone mapping, stitching, and/or encoding)to generate output images based on image data from the image sensors 314and 316. The processing apparatus 312 may include one or more processorshaving single or multiple processing cores. The processing apparatus 312may include memory, such as a random-access memory device (RAM), flashmemory, or another suitable type of storage device such as anon-transitory computer-readable memory. The memory of the processingapparatus 312 may include executable instructions and data that can beaccessed by one or more processors of the processing apparatus 312.

For example, the processing apparatus 312 may include one or moredynamic random access memory (DRAM) modules, such as double data ratesynchronous dynamic random-access memory (DDR SDRAM). In someimplementations, the processing apparatus 312 may include a digitalsignal processor (DSP). In some implementations, the processingapparatus 312 may include an application specific integrated circuit(ASIC). For example, the processing apparatus 312 may include a customimage signal processor.

The first image sensor 314 and the second image sensor 316 may beconfigured to detect light of a certain spectrum (e.g., the visiblespectrum or the infrared spectrum) and convey information constitutingan image as electrical signals (e.g., analog or digital signals). Forexample, the image sensors 314 and 316 may include CCDs or active pixelsensors in a CMOS. The image sensors 314 and 316 may detect lightincident through a respective lens (e.g., a fisheye lens). In someimplementations, the image sensors 314 and 316 include digital-to-analogconverters. In some implementations, the image sensors 314 and 316 areheld in a fixed orientation with respective fields of view that overlap.

The communications interface 318 may enable communications with apersonal computing device (e.g., a smartphone, a tablet, a laptopcomputer, or a desktop computer). For example, the communicationsinterface 318 may be used to receive commands controlling image captureand processing in the image capture device 310. For example, thecommunications interface 318 may be used to transfer image data to apersonal computing device. For example, the communications interface 318may include a wired interface, such as a high-definition multimediainterface (HDMI), a universal serial bus (USB) interface, or a FireWireinterface. For example, the communications interface 318 may include awireless interface, such as a Bluetooth interface, a ZigBee interface,and/or a Wi-Fi interface.

The user interface 320 may include an LCD display for presenting imagesand/or messages to a user. For example, the user interface 320 mayinclude a button or switch enabling a person to manually turn the imagecapture device 310 on and off. For example, the user interface 320 mayinclude a shutter button for snapping pictures.

The battery 322 may power the image capture device 310 and/or itsperipherals. For example, the battery 322 may be charged wirelessly orthrough a micro-USB interface.

Referring to FIG. 3B, another image capture system 330 is shown. Theimage capture system 330 includes an image capture device 340 and apersonal computing device 360 that communicate via a communications link350. The image capture device 340 may, for example, be the image capturedevice 100 shown in FIGS. 1A-D. The personal computing device 360 may,for example, be the user interface device described with respect toFIGS. 1A-D.

The image capture device 340 includes an image sensor 342 that isconfigured to capture images. The image capture device 340 includes acommunications interface 344 configured to transfer images via thecommunication link 350 to the personal computing device 360.

The personal computing device 360 includes a processing apparatus 362that is configured to receive, using a communications interface 366,images from the image sensor 342. The processing apparatus 362 may beconfigured to perform image signal processing (e.g., filtering, tonemapping, stitching, and/or encoding) to generate output images based onimage data from the image sensor 342.

The image sensor 342 is configured to detect light of a certain spectrum(e.g., the visible spectrum or the infrared spectrum) and conveyinformation constituting an image as electrical signals (e.g., analog ordigital signals). For example, the image sensor 342 may include CCDs oractive pixel sensors in a CMOS. The image sensor 342 may detect lightincident through a respective lens (e.g., a fisheye lens). In someimplementations, the image sensor 342 includes digital-to-analogconverters. Image signals from the image sensor 342 may be passed toother components of the image capture device 340 via a bus 346.

The communications link 350 may be a wired communications link or awireless communications link. The communications interface 344 and thecommunications interface 366 may enable communications over thecommunications link 350. For example, the communications interface 344and the communications interface 366 may include an HDMI port or otherinterface, a USB port or other interface, a FireWire interface, aBluetooth interface, a ZigBee interface, and/or a Wi-Fi interface. Forexample, the communications interface 344 and the communicationsinterface 366 may be used to transfer image data from the image capturedevice 340 to the personal computing device 360 for image signalprocessing (e.g., filtering, tone mapping, stitching, and/or encoding)to generate output images based on image data from the image sensor 342.

The processing apparatus 362 may include one or more processors havingsingle or multiple processing cores. The processing apparatus 362 mayinclude memory, such as RAM, flash memory, or another suitable type ofstorage device such as a non-transitory computer-readable memory. Thememory of the processing apparatus 362 may include executableinstructions and data that can be accessed by one or more processors ofthe processing apparatus 362. For example, the processing apparatus 362may include one or more DRAM modules, such as DDR SDRAM.

In some implementations, the processing apparatus 362 may include a DSP.In some implementations, the processing apparatus 362 may include anintegrated circuit, for example, an ASIC. For example, the processingapparatus 362 may include a custom image signal processor. Theprocessing apparatus 362 may exchange data (e.g., image data) with othercomponents of the personal computing device 360 via a bus 368.

The personal computing device 360 may include a user interface 364. Forexample, the user interface 364 may include a touchscreen display forpresenting images and/or messages to a user and receiving commands froma user. For example, the user interface 364 may include a button orswitch enabling a person to manually turn the personal computing device360 on and off In some implementations, commands (e.g., start recordingvideo, stop recording video, or capture photo) received via the userinterface 364 may be passed on to the image capture device 340 via thecommunications link 350.

FIG. 4 shows another image capture device 400. The image capture device400 can be similar to the image capture devices 100, 200, 300 of FIGS.1-3B. For example, the image capture device 400 can include a body orhousing 402 having a lens cover 404 structured on a front surface of thehousing 402, various indicators on the front of the surface of thehousing 402 (such as LEDs, displays, and the like), various inputmechanisms (such as buttons, switches, and touch-screen mechanisms), andelectronics (e.g., imaging electronics, power electronics, etc.)internal to the housing 402 for capturing images via a lens (not shown)situated beneath the lens cover 404 and/or for performing otherfunctions. The image capture device 400 may be configured to captureimages and video and to store captured images and video for subsequentdisplay or playback.

The image capture device 400 in the example in FIG. 4 is shown without aremovable door, that is, the removable door has been removed to allowthe user of the image capture device 400 to remove or insert a battery(not shown) or otherwise couple or use the image capture device 400 withvarious accessories (e.g., expansion packs, alternate batteries, etc.,not shown). When present, the removable door can be removably secured ina closed position, for example, using fastening structures (e.g., hingestructures or mechanisms and/or latch structures or mechanisms) thatengage retention features 406 of the housing 402 of the image capturedevice 400.

The retention features 406 integrated into the housing 402 of the imagecapture device 400 can include hinge structures, such as pins, bars,clamps, etc. The retention features 406 can also include depressions,cavities, or channels defined on various surfaces, both internal andexternal, of the housing 402 of the image capture device 400. These areonly examples of the retention features 406. Other types of integratedretention features 406 (not shown) on the housing 402 of the imagecapture device 400 are also possible.

As shown in FIG. 4, the image capture device 400 can define a batterycavity 408 and include an imaging communication interface 410 that canbe covered by the removable door (not shown). In the closed position ofthe removable door (not shown), the user is prohibited access to thebattery cavity 408 and the imaging communication interface 410 by theremovable door. In the removed position of the removable door (e.g., asshown in FIG. 4), any fastening structures (not shown) present on theremovable door are separated from the retention features 406 and theuser is allowed unencumbered access to the battery cavity 408 and theimaging communication interface 410. When the removable door is openedor removed (e.g., as shown in FIG. 4), air, moisture, or humidity may bepassively vented from the battery cavity 408.

The image capture device 400 can include a housing vent 412 between thehousing 402 and an interior of the image capture device 400. The housingvent 412 can serve to equalize pressure between internal componentswithin the image capture device 400 and an external environmentsurrounding the image capture device 400. The housing vent 412 can alsoserve as a path for heat to exit the housing 402. The housing vent 412can be fluidly coupled to the battery cavity 408 to support pressureequalization. Additional fluid couplings within the housing 402 of theimage capture device 400 are described herein in reference to FIG. 5.

FIG. 5 is a cross-sectional view of the image capture device 400 of FIG.4 through section 5-5 with representative cavities shown for explanationpurposes only. The cavities described may have different dimensions orlocations within the image capture device 400, but are simplified forthe purpose of describing potential sources of moisture within anotherwise fluidly sealed image capture device. The image capture devicecan be fluidly sealed when an access door (i.e., a door that is openableand closeable) or removable door (not shown) is present and secured tothe housing 402.

The housing 402 forms an outer perimeter of the image capture device400. The lens cover 404 is located at an upper-right portion of thecross-section of FIG. 5. The lens cover 404 contacts the housing 402 andsits outboard of a lens 500. The space between the lens 500 and the lenscover 404 defines a lens cavity 502. Both the lens 500 and the lenscover 404 are formed from transparent or light-transmissive materials(e.g., glass or acrylic). These materials can be susceptible to foggingunder certain conditions such as increased environmental humidity levelsand/or temperature changes.

The lens cavity 502 can be fluidly coupled to the battery cavity 408 byway of a lens vent 504. The lens vent 504 can surround the lens 500. Insome examples, the lens 500 may have a generally cylindrical shape, andto surround the lens, the lens vent 504 may also have a tubular orgenerally cylindrical shape. Other shapes for the lens vent 504 are alsopossible. When the lens 500 has a tubular or generally cylindricalshape, an O-ring may surround the lens 500 and substantially block orobstruct fluid flow (i.e., air or water) between the lens cavity 502 andthe battery cavity 408 so that fogging of the lens 500 is reduced. Onthe lens cover 404 and/or the lens 500, a glass coating may be appliedthat assists with reducing fogging of the lens cover 404 or the lens 500when moisture is present in the lens cavity 502.

The lens vent 504 may be obstructed, for example, by a seal 506. Theseal 506 is shown with a hatched pattern and may be designed such thatno particulates are able to pass between the battery cavity 408 and thelens cavity 502 via the lens vent 504, but air, water, or both may stillpass or move in order equalize pressure or moisture content between thebattery cavity 408 and the lens cavity 502. However, in some examples,the seal 506 is impermeable such that particles, air, moisture,humidity, or any combination thereof are not prevented from entering (orleaving) the lens cavity 502 by way of the battery cavity 408. In thisexample, since the seal 506 is impermeable, the lens cavity 502 and thebattery cavity 408 would lack a fluid connection. Whether the seal 506is permeable, semi-permeable, or impermeable, the lens 500, the lenscover 404, or both may be removable so that the image capture device 400can be more easily vented or flushed of air or moisture contaminants byexposing the lens cavity 502, the battery cavity 408, or both to theexternal environment. When the lens cover 404 is removed, the venting ofair or moisture assists to keep the lens 500, the lens cover 404, orboth free of fog. The seal 506 may be one or more of an open-cell foam,closed-cell foam, adhesive, semi-permeable ring, a rubber O-ring, or anycombination thereof. The seal 506 may be composed of one or more of anacrylic, polyethylene, polyurethane, polyvinyl chloride, nitrilebutadiene rubber, polyolefin, silicone, polychloroprene, ethylenepropylene diene monomer rubber, styrene-butadiene, butadiene, blendsthereof, or any combination thereof.

In conjunction, the seal 506 and the lens vent 504 may provide a channelor fluid path for passively moving moisture or air that has entered thelens cavity 502 to the outside environment when the battery cavity 408,the housing vent 412, or both are in fluid connection with the externalenvironment. For example, the removable door (not shown) of the batterycavity 408 may be opened or removed so that the battery cavity 408 isexposed to the outside environment for venting purposes or exchangingthe battery. In another example, the housing vent 412 provides a pathwayfor venting air or moisture from the battery cavity 408 by beingopenable or always open. The housing vent 412 may include a housing seal(not shown), which may be a similar structure or material to the seal506, that can actively vent humidity by being selectively openable andclosable or may passively vent air or humidity by being a permeable orsemi-permeable seal 506. Situations may exist where one or both of thehousing vent 412 and the battery cavity 408 are open so that air ormoisture can be passively vented from the lens cavity 502, the batterycavity 408, or both. If air with increased humidity enters the lenscavity 502, the humidity may cause fogging of the lens 500 or the lenscover 404 depending on other environmental or operating conditions(e.g., temperatures extremes, long-duration operation of the imagecapture device 400, etc.). However, the fogging may be mitigated by thepassive venting described here because the seal 506 is configured tomove the humidity out of the lens cavity 502 when the internalcomponents of the image capture device 400 are exposed to the outsideenvironment.

The housing vent 412 can fluidly couple the battery cavity 408 and anexternal environment surrounding the image capture device 400. Thehousing vent 412 can include another seal (not shown), similar to seal506, or other means of blocking particulates from moving between thebattery cavity 408 and the external environment, but may at the sametime allow air to pass or vent between the battery cavity 408 and theexternal environment. If air with increased humidity enters the housingvent 412, it may pass from the housing vent 412, to the battery cavity408, along the lens vent 504, and into the lens cavity 502 underspecific temperatures and pressure conditions. In some examples, thehousing vent 412 may more easily distribute air or moisture between thebattery cavity 408 and the external environment by providing a passiveairflow mechanism for moving humidity.

Though a great majority of moisture or wetness is blocked from enteringthe housing 402 based on sealing (not shown) between various componentswithin the image capture device 400, unintentional moistureintroduction, such as loading a wet battery into the battery cavity 408or operating the image capture device in a hot, humid environment for anextended period of time without the presence of a removable door (suchas the removable door 115 of FIG. 1) may lead to a small amount ofmoisture moving between various cavities and vents (e.g., the batterycavity 408, the housing vent 412, the lens cavity 502, and the lens vent504) within the housing 402 so as to risk fogging of the lens 500 or thelens cover 404 in certain operating environments. This moisture can bereduced or eliminated using the desiccant patch described in FIGS. 6A-7.

FIGS. 6A and 6B show a top view (FIG. 6A) and a side view (FIG. 6B) of adesiccant patch 600. As best shown in FIG. 6A, the desiccant patch 600can be generally square, having a first dimension, H, that measuresbetween 15 mm and 35 mm, and a second dimension, W, that measuresbetween 15 mm and 35 mm. The ranges are examples, as the desiccant patch600 may be sized to be slightly smaller than a surface of a component,such as a side surface of a battery, as described herein in reference toFIG. 7.

As best shown in FIG. 6B, the desiccant patch 600 includes an absorbentlayer 602 represented using a dotted pattern and an adhesive layer 604represented using a vertical-line pattern. The absorbent layer 602 canbe formed of a hygroscopic material, that is, a material sufficient toboth absorb and retain moisture from the surrounding environment.Hygroscopic materials can include silica gel, sodium chloride, calciumchloride, copper sulfate, potassium carbonate, potassium hydroxide,lithium bromide, and/or sodium hydroxide, among other non-listedexampled. In one example, the absorbent layer 602 can be an absorbentpaper including silica gel particles in a cellulose fiber matrix. Theabsorbent layer 602 can have a thickness between 0.1 mm and 0.6 mm and awater absorption capability of between 300 g/m² and 500 g/m². In anotherexample, the absorbent layer can have a thickness between 0.2 mm and 0.4mm and a wet burst resistance, that is, a wet strength or capability toresist rupture, between 75 kPa and 125 kPa. The absorbent layer 602 isdesigned to attract and capture any moisture that enters any of thefluidly coupled vents and cavities (e.g., the battery cavity 408, thehousing vent 412, the lens cavity 502, and the lens vent 504) to reduceor remove the possibility of fogging for the lens cover 404 or the lens500.

The adhesive layer 604 can be formed from a pressure-sensitive adhesive(PSA), such as an acrylic, acrylic foam, silicone, or other material,sufficient to adhere the desiccant patch 600 to a surface of a componentin the image capture device 400. In one example, the adhesive layer 604can have a thickness between 0.02 mm and 0.08 mm. In another example,the adhesive layer 604 can have a thickness between 0.03 mm and 0.05 mm.The surface receiving the adhesive layer 604 can be a side surface of abattery as described herein in reference to FIG. 7.

FIG. 7 is a side view of a battery 700 including the desiccant patch 600of FIGS. 6A-6B. The desiccant patch 600 is coupled to a side surface 702of the battery 700, for example, using the adhesive layer 604 (see FIG.6B) to couple the side surface 702 and the desiccant patch 600. Thedesiccant patch 600 of FIG. 7 is generally square with dimensions ofheight (H_P) and width (W_P) being equal or approximately equal. Incontrast, the side surface 702 of the battery 700 has an irregularperimeter, with a height (H_B) greater than the height (H_P) of thedesiccant patch 600 and a width (W_B) greater than the width (W_P) ofthe desiccant patch 600. The smaller size of the desiccant patch 600 ascompared to the size of the side surface 702 of the battery 700 isintended to account for variation in application of the desiccant patch600. In one example, the height H_P can be between 20 mm and 30 mm andthe width W_P can be between 20 mm and 30 mm whereas the height H_B canbe between 25 mm and 50 mm and the width W_B can be between 25 mm and 50mm.

The desiccant patch 600 can be located on and adhered or otherwisecoupled to the side surface 702 of the battery 700 prior to loading thebattery 700 into a battery cavity such as the battery cavity 408 shownin the image capture device 400 in FIG. 4. When the desiccant patch 600is coupled to the battery 700 and then loaded into a battery cavity suchas the battery cavity 408 of the image capture device 400 shown in FIG.4, any moisture that moves between vents (e.g., the housing vent 412 andthe lens vent 504) and cavities (e.g. the battery cavity 408 and thelens cavity 502) along fluidly coupled passages within the housing 402can be absorbed by the desiccant patch 600. Further, locating thedesiccant patch 600 on the side surface 702 of the battery 700 allowsthe materials that form the absorbent layer 602 of the desiccant patch600 to be directly exposed to the main fluid passages, for example, thehousing vent 412 and the lens vent 504, within the image capture device400 as shown in FIGS. 4 and 5.

When located on the side surface 702 of the battery 700 as shown anddescribed in respect to FIG. 7, the desiccant patch 600 can attract andabsorb moisture present within the housing 402, greatly reducing orremoving the potential for fogging to occur on the lens 500 or the lenscover 404 as shown in FIG. 5. The side surface 702 to which thedesiccant patch 600 is coupled can be any of the sides configured to fitinto the battery cavity 408. In the example of FIG. 5, the battery 700can be located within the battery cavity 408, and the side surface 702of the battery 700 that includes the desiccant patch 600 can bepositioned proximate to the housing vent 412 and the lens vent 504. Inother examples, the desiccant patch 600 can be located on a side surfaceof the battery 700 opposite the housing vent 412 and the lens vent 504.The desiccant patch 600 can absorb moisture from within the housing 402so long as any cavity, recess, and/or passage that includes moisture isin fluid communication with the battery cavity 408 where the desiccantpatch 600 is located.

While the disclosure has been described in connection with certainembodiments, it is to be understood that the disclosure is not to belimited to the disclosed embodiments but, on the contrary, is intendedto cover various modifications and equivalent arrangements includedwithin the scope of the appended claims, which scope is to be accordedthe broadest interpretation so as to encompass all such modificationsand equivalent structures as is permitted under the law.

What is claimed is:
 1. An image capture device, comprising: a housing; alens cover disposed on the housing; a lens disposed within the housingbeneath the lens cover; a lens cavity defined between the lens and thelens cover; a battery cavity defined within the housing; a lens ventfluidly coupling the lens cavity and the battery cavity; a batterydisposed within the battery cavity; and a desiccant patch coupled to aside of the battery, wherein moisture introduced into the battery cavityby the battery, the lens cavity, or the lens vent is absorbed by thedesiccant patch.
 2. The image capture device of claim 1, furthercomprising: a housing vent fluidly coupling the battery cavity and anexternal environment surrounding the image capture device, whereinmoisture introduced from the external environment into the batterycavity by the housing vent is absorbed by the desiccant patch.
 3. Theimage capture device of claim 1, wherein the desiccant patch comprises:an absorbent layer; and an adhesive layer.
 4. The image capture deviceof claim 3, wherein the absorbent layer is formed from a hygroscopicmaterial.
 5. The image capture device of claim 4, wherein thehygroscopic material includes at least one of silica gel, sodiumchloride, calcium chloride, copper sulfate, potassium carbonate,potassium hydroxide, lithium bromide, or sodium hydroxide
 6. The imagecapture device of claim 3, wherein the adhesive layer is formed from apressure-sensitive adhesive.
 7. The image capture device of claim 6,wherein the pressure-sensitive adhesive includes at least one ofacrylic, acrylic foam, or silicone.
 8. The image capture device of claim1, wherein the side of the battery that includes the desiccant patch isproximate to the lens vent.
 9. An image capture device, comprising: ahousing; a battery cavity defined within the housing; a removable doorseparating the battery cavity and an external environment; a lensdisposed in the housing proximate to the battery cavity; a lens coverdisposed over the lens, contacting the housing, and fluidly separatingthe lens from an external environment; a lens cavity defined between thelens and the lens cover; a seal obstructing a channel that fluidlycouples the lens cavity and the battery cavity; and a housing ventconfigured to fluidly couple the battery cavity and the externalenvironment.
 10. The image capture device of claim 9, wherein the lensis covered by a glass coating that is configured to reduce fog in thelens cavity.
 11. The image capture device of claim 9, wherein the lens,the lens cover, or both are removable from the housing so that the lenscavity, the battery cavity, or both are configured to vent air ormoisture to the external environment to keep the lens and the lens coverfree of fog.
 12. The image capture device of claim 9, wherein the sealis permeable so that air or moisture is movable between the lens cavityand the battery cavity along the channel, and wherein the seal and thehousing vent are configured to passively move air or moisture betweenthe lens cavity, the battery cavity, and the external environment. 13.The image capture device of claim 12, wherein when the removable door isopened or removed, air or moisture is ventable from the lens cavitythrough the housing vent, the removable door, or both.
 14. The imagecapture device of claim 9, wherein the seal is impermeable so that air,moisture, and particles are not movable between the battery cavity andthe lens cavity.
 15. The image capture device of claim 9, wherein theseal comprises one or more of acrylic, polyethylene, polyurethane,polyvinyl chloride, nitrile butadiene rubber, polyolefin, silicone,polychloroprene, ethylene propylene diene monomer rubber,styrene-butadiene, butadiene, blends thereof, or any combinationthereof.
 16. An image capture device, comprising: a battery cavity; ahousing surrounding the battery cavity; a lens insertable into thehousing at a location proximate to the battery cavity; a lens covercontacting the housing and fluidly separating the lens from an externalenvironment; a lens cavity between the lens and the lens cover; a sealobstructing a fluid path between the lens cavity and the battery cavity;and a housing vent connecting the battery cavity and an externalenvironment surrounding the image capture device.
 17. The image capturedevice of claim 16, wherein the housing vent includes a housing sealconfigured to allow air or moisture to passively flow between thebattery cavity and the external environment.
 18. The image capturedevice of claim 16, wherein the housing vent includes a housing sealthat is selectively openable and closable so that the housing sealrespectively vents or seals the battery cavity.
 19. The image capturedevice of claim 16, wherein the seal is permeable so that air, moisture,or both are movable between the lens cavity and the battery cavity. 20.The image capture device of claim 16, wherein the seal is impermeable sothat the lens cavity lacks a fluid connection with the battery cavity.